A fish feed useful in a method for smoltification and prevention of desmoltification in Salmonidae and a method for producing a fish feed useful in the method. The feed contains protein, fat, carbohydrates, vitamins, minerals and water, and in addition comprises sodium salts (Na + ) from 10 -100 g/kg by weight, polyvalent cation receptor modulator (PVCR) from 1-10 g/kg by weight, magnesium salts (Mg 2+ ) from 0.1-100 g/kg by weight, and calcium salts (Ca 2+ ) from 0.1-100 g/kg by weight.MÉTODO PARA ALIMENTACIÓN DE PECES, MÉTODO PARA LA ESMOLTIFICACIÓN Y LA PREVENCIÓN DE LA DESMOLTIFICACIÓN DE SALMÓNIDOS, Y PARA LA PROFILAXIS Y TRATAMIENTO DEL SÍNDROME HEMORRÁGICO DEL SMOLT (SHS) EN SALMÓNIDOS
